Coal mine gas extraction system

Abstract

The utility model provides a kind of coal mine gas extraction system.The coal mine gas extraction system includes the borehole of being arranged in the side wall of roadway, high negative pressure pipeline, low negative pressure pipeline and connecting pipeline, high negative pressure pipeline and low negative pressure pipeline are all arranged in roadway, the negative pressure of high negative pressure pipeline is greater than the negative pressure of low negative pressure pipeline, one end of connecting pipeline is connected with borehole, the other end of connecting pipeline is connected with high negative pressure pipeline and low negative pressure pipeline, and it can switch with one of high negative pressure pipeline and low negative pressure pipeline and with another interruption.The utility model discloses a coal mine gas extraction system, when gas extraction resistance is higher, make connecting pipeline and high negative pressure pipeline communicate and with low negative pressure pipeline interruption, to ensure that through borehole high efficiency gas extraction, when gas extraction resistance is lower, make connecting pipeline and low negative pressure pipeline communicate and with high negative pressure pipeline interruption, extract gas through low negative pressure pipeline and have lower energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of coal mining, specifically to a coal mine gas extraction system. Background Technology

[0002] During the longwall mining of coal mines, boreholes need to be drilled in the sidewalls of the roadways and connected to negative pressure pipelines to extract gas, thereby ensuring the safety of the working face. However, the gas extraction efficiency of related technologies is low and the energy consumption is high. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of this utility model propose a coal mine gas extraction system.

[0005] The coal mine gas extraction system of this utility model embodiment includes:

[0006] The tunnel includes a borehole, a high negative pressure pipe, a low negative pressure pipe, and a connecting pipe, all installed on the sidewall of the tunnel. The high negative pressure pipe and the low negative pressure pipe are both located within the tunnel. The negative pressure of the high negative pressure pipe is greater than that of the low negative pressure pipe. One end of the connecting pipe is connected to the borehole, and the other end of the connecting pipe is connected to both the high negative pressure pipe and the low negative pressure pipe. The connecting pipe can be switched between being connected to one of the high negative pressure pipe and being disconnected from the other.

[0007] The coal mine gas extraction system of this utility model, when the gas extraction resistance is high, connects the connecting pipe to the high negative pressure pipe and disconnects it from the low negative pressure pipe, thereby ensuring efficient gas extraction through boreholes. When the gas extraction resistance is low, connects the connecting pipe to the low negative pressure pipe and disconnects it from the high negative pressure pipe, extracting gas through the low negative pressure pipe with lower energy consumption.

[0008] In some embodiments, the coal mine gas extraction system further includes a sensor and a controller. The sensor is connected to the connecting pipe to acquire the pressure value of the medium inside the connecting pipe. The sensor is connected to the controller to transmit the acquired pressure value to the controller. The controller is connected to the connecting pipe to control the connection between the connecting pipe and the high negative pressure pipe, and to control the connection between the connecting pipe and the low negative pressure pipe, based on the received pressure value. This allows the connecting pipe to be switchably connected to one of the high negative pressure pipe and the low negative pressure pipe and disconnected from the other.

[0009] In some embodiments, the controller has a preset pressure threshold and can compare the acquired pressure value with the pressure threshold. When the pressure value is less than the pressure threshold, the controller controls the connecting pipe to connect with the high negative pressure pipe and controls the connecting pipe to disconnect from the low negative pressure pipe. When the pressure value is greater than or equal to the pressure threshold, the controller controls the connecting pipe to disconnect from the high negative pressure pipe and controls the connecting pipe to connect with the low negative pressure pipe; and / or

[0010] When the pressure value received by the controller decreases, the controller controls the connecting pipe to connect with the high negative pressure pipe and controls the connecting pipe to disconnect from the low negative pressure pipe. When the pressure value received by the controller increases and becomes constant, the controller controls the connecting pipe to disconnect from the high negative pressure pipe and controls the connecting pipe to connect with the low negative pressure pipe.

[0011] In some embodiments, the coal mine gas extraction system further includes a sensor and a controller. The sensor is connected to the connecting pipe and is used to acquire the flow rate of the medium in the connecting pipe. The sensor is connected to the controller to transmit the acquired flow rate to the controller. The controller is connected to the connecting pipe to control the connection between the connecting pipe and the high negative pressure pipe, and to control the connection between the connecting pipe and the low negative pressure pipe, based on the received flow rate, so that the connecting pipe can be switched to be connected to one of the high negative pressure pipe and the low negative pressure pipe and disconnected from the other.

[0012] In some embodiments, the controller has a preset flow threshold and can compare the acquired flow value with the flow threshold. When the flow value is less than the flow threshold, the controller controls the connecting pipe to connect with the high negative pressure pipe and controls the connecting pipe to disconnect from the low negative pressure pipe. When the flow value is greater than or equal to the flow threshold, the controller controls the connecting pipe to disconnect from the high negative pressure pipe and controls the connecting pipe to connect with the low negative pressure pipe; and / or

[0013] When the flow rate value received by the controller decreases, the controller controls the connecting pipe to connect with the high negative pressure pipe and controls the connecting pipe to disconnect from the low negative pressure pipe. When the flow rate value received by the controller increases and becomes constant, the controller controls the connecting pipe to disconnect from the high negative pressure pipe and controls the connecting pipe to connect with the low negative pressure pipe.

[0014] In some embodiments, the connecting pipe includes a first pipe section, a second pipe section, a third pipe section, and a reversing valve. The first pipe section is connected between the inlet of the reversing valve and the borehole. The second pipe section is connected between the first outlet of the reversing valve and the high negative pressure pipe. The third pipe section is connected between the second outlet of the reversing valve and the low negative pressure pipe. The reversing valve controllably opens one of the first outlet and the second outlet and closes the other.

[0015] In some embodiments, the coal mine gas extraction system further includes a sensor and a controller. The sensor is connected to the first pipe section to acquire the pressure or flow rate of the medium in the first pipe section. The sensor is connected to the controller to transmit the acquired pressure or flow rate to the controller. The controller is connected to the reversing valve to control the reversing valve to open one of the first outlet and the second outlet and close the other according to the received pressure or flow rate.

[0016] In some embodiments, the coal mine gas extraction system further includes an extraction pump station located within the roadway. The extraction pump station includes a high-negative-pressure extraction pump and a low-negative-pressure extraction pump. The high-negative-pressure extraction pump is connected to the high-negative-pressure pipeline to generate negative pressure in the high-negative-pressure pipeline. The low-negative-pressure extraction pump is connected to the low-negative-pressure pipeline to generate negative pressure in the low-negative-pressure pipeline. When the connecting pipeline is connected to the high-negative-pressure pipeline and disconnected from the low-negative-pressure pipeline, the high-negative-pressure extraction pump is turned on and the low-negative-pressure extraction pump is turned off. When the connecting pipeline is disconnected from the high-negative-pressure pipeline and connected to the low-negative-pressure pipeline, the high-negative-pressure extraction pump is turned off and the low-negative-pressure extraction pump is turned on.

[0017] In some embodiments, the borehole is located on the sidewall of the tunnel and is inclined along the extension direction of the tunnel.

[0018] In some embodiments, the angle between the drilling direction of the borehole and the extension direction of the tunnel is 30° to 60°.

[0019] In some embodiments, the tunnel includes a transport tunnel and a return air tunnel arranged side by side. The sidewalls of both the transport tunnel and the return air tunnel are provided with the drilled holes. Both the transport tunnel and the return air tunnel are equipped with a high negative pressure pipe, a low negative pressure pipe, and a connecting pipe. The high negative pressure pipe and the low negative pressure pipe in the transport tunnel are connected to the drilled holes on the sidewall of the transport tunnel via the connecting pipe. The high negative pressure pipe and the low negative pressure pipe in the return air tunnel are connected to the drilled holes on the sidewall of the return air tunnel via the connecting pipe. The drilled holes on the sidewalls of the transport tunnel and the return air tunnel are inclined in the same direction along the extension direction of the tunnel; and / or

[0020] The bottom end of the borehole connecting the high negative pressure pipeline is located inside the coal seam, and the borehole connecting the low negative pressure pipeline penetrates the coal seam. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the coal mine gas extraction system in use according to an embodiment of this utility model. Figure 1 Medium and high negative pressure pipelines and their connecting boreholes and connecting pipes are shown in solid lines, while low negative pressure pipelines and their connecting boreholes and connecting pipes are shown in dashed lines. Only the parts of high negative pressure pipelines, low negative pressure pipelines and connecting pipes that are connected to the boreholes are shown.

[0022] Figure 2 This is a partial schematic diagram of a coal mine gas extraction system according to an embodiment of the present invention.

[0023] Figure label:

[0024] 1. Roadway; 11. Transport roadway; 12. Return air roadway; 2. Borehole; 3. High negative pressure pipeline; 4. Low negative pressure pipeline; 5. Connecting pipeline; 51. First pipe section; 52. Second pipe section; 53. Third pipe section; 54. Reversing valve; 6. Sensor; 7. Controller; 8. Pumping station; 81. High negative pressure drainage pump; 82. Low negative pressure drainage pump; 9. Coal seam. Detailed Implementation

[0025] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] The following is for reference. Figure 1 and Figure 2 This invention describes a coal mine gas extraction system according to an embodiment of the present invention.

[0027] like Figure 1 and Figure 2 As shown, the coal mine gas extraction system of this utility model embodiment includes a borehole 2, a high negative pressure pipeline 3, a low negative pressure pipeline 4, and a connecting pipeline 5.

[0028] Borehole 2 is located on the side wall of tunnel 1. Specifically, as shown... Figure 1 As shown, the sidewall of the roadway 1 is provided with boreholes 2 extending into the coal seam 9. The boreholes 2 are preferably, but not limited to, multiple boreholes arranged sequentially along the extension direction of the roadway 1.

[0029] Both high-negative-pressure pipe 3 and low-negative-pressure pipe 4 are located within roadway 1, with the negative pressure of high-negative-pressure pipe 3 being greater than that of low-negative-pressure pipe 4. Specifically, as follows... Figure 1As shown, the high negative pressure pipe 3 and the low negative pressure pipe 4 are preferably, but not limited to, arranged along the extension direction of the roadway 1. Both the high negative pressure pipe 3 and the low negative pressure pipe 4 have negative pressure in their cavities, with the negative pressure of the high negative pressure pipe 3 being greater than that of the low negative pressure pipe 4, so that the high negative pressure pipe 3 has a stronger suction capacity than the low negative pressure pipe 4. The negative pressure of the high negative pressure pipe 3 is preferably, but not limited to, -10 kPa to -30 kPa, and the negative pressure of the low negative pressure pipe 4 is preferably, but not limited to, -5 kPa to -10 kPa.

[0030] One end of the connecting pipe 5 is connected to the borehole 2, and the other end of the connecting pipe 5 is connected to both the high negative pressure pipe 3 and the low negative pressure pipe 4. It can be switched between connecting to one of the high negative pressure pipe 3 and the low negative pressure pipe 4 and disconnected from the other. Specifically, as shown... Figure 1 As shown, connecting pipes 5 and boreholes 2 are configured in a one-to-one correspondence. One end of connecting pipe 5 is connected to and maintains communication with borehole 2, while the other end is connected to both high-pressure pipe 3 and low-pressure pipe 4. It can switch between being connected to one of these pipes and disconnected from the other. In other words, the other end of connecting pipe 5 can switch between a first connection state and a second connection state. In the first connection state, the other end of connecting pipe 5 is connected to the high-pressure pipe 3 and disconnected from the low-pressure pipe 4. In the second connection state, the other end of connecting pipe 5 is disconnected from the high-pressure pipe 3 and connected to the low-pressure pipe 4. In the first connection state, borehole 2 is connected to the high-pressure pipe 3 via connecting pipe 5, allowing gas to be extracted through borehole 2 by the high-pressure pipe 3. In the second connection state, borehole 2 is connected to the low-pressure pipe 4 via connecting pipe 5, allowing gas to be extracted through borehole 2 by the low-pressure pipe 4.

[0031] Because the high-pressure pipeline 3 has a stronger suction capacity than the low-pressure pipeline 4, borehole 2 connected to the high-pressure pipeline 3 has better gas extraction efficiency and capacity compared to connecting to the low-pressure pipeline 4. Since the negative pressure of both the high-pressure and low-pressure pipelines 3 is directly proportional to energy consumption, borehole 2 connected to the low-pressure pipeline 4 has lower energy consumption compared to connecting to the high-pressure pipeline 3.

[0032] The diameters of the high negative pressure pipe 3 and the low negative pressure pipe 4 can be set to be the same, or the diameter of the high negative pressure pipe 3 can be set to be larger than the diameter of the low negative pressure pipe 4.

[0033] In this embodiment of the coal mine gas extraction system, when the gas extraction resistance is high, the connecting pipe 5 is connected to the high negative pressure pipe 3 and interrupted by the low negative pressure pipe 4, thereby ensuring efficient gas extraction through the borehole 2. When the gas extraction resistance is low, the connecting pipe 5 is connected to the low negative pressure pipe 4 and interrupted by the high negative pressure pipe 3, allowing gas extraction through the low negative pressure pipe 4 with lower energy consumption.

[0034] In some embodiments, the coal mine gas extraction system further includes a sensor 6 and a controller 7. The coal mine gas extraction system of this utility model provides two embodiments based on the type of sensor 6.

[0035] In an embodiment where sensor 6 employs the first type, such as Figure 2 As shown, sensor 6 is connected to connecting pipe 5 and is used to obtain the pressure value of the medium inside connecting pipe 5. In other words, sensor 6 is a pressure sensor connected to connecting pipe 5 and is used to obtain the pressure value of the gas extracted from borehole 2 in connecting pipe 5.

[0036] Sensor 6 is connected to controller 7, preferably but not limited to an electrical connection via wired or wireless means, to transmit the acquired pressure value to controller 7.

[0037] The controller 7 is connected to the connecting pipe 5 to control the connection between the connecting pipe 5 and the high negative pressure pipe 3, and to control the connection between the connecting pipe 5 and the low negative pressure pipe 4, based on the received pressure value. This allows the connecting pipe 5 to be switched between being connected to one of the high negative pressure pipe 3 and the low negative pressure pipe 4, and disconnected from the other. In other words, the controller 7 controls the connecting pipe 5 to switch between a first connection state and a second connection state based on the received pressure value.

[0038] Optionally, the controller 7 has a preset pressure threshold and can compare the acquired pressure value with the pressure threshold.

[0039] When the pressure value is less than the pressure threshold, it indicates high gas extraction resistance. Controller 7 controls the connection between connecting pipe 5 and high negative pressure pipe 3, and controls the connection between connecting pipe 5 and low negative pressure pipe 4 to be interrupted. In other words, controller 7 controls connecting pipe 5 to switch to the first connection state to ensure high gas extraction efficiency.

[0040] When the pressure value is greater than or equal to the pressure threshold, it indicates that the gas extraction resistance is low. Controller 7 controls the connection pipe 5 to disconnect from the high negative pressure pipe 3 and controls the connection pipe 5 to connect with the low negative pressure pipe 4. In other words, controller 7 controls the connection pipe 5 to switch to the second connection state, resulting in lower energy consumption.

[0041] Optionally, when the pressure value received by controller 7 decreases, it indicates an increase in gas extraction resistance. Controller 7 controls the connection between connecting pipe 5 and high negative pressure pipe 3, and controls the connection between connecting pipe 5 and low negative pressure pipe 4 to be disconnected. In other words, controller 7 controls connecting pipe 5 to switch to the first connection state to ensure higher gas extraction efficiency.

[0042] When the pressure value received by controller 7 increases or remains constant, it indicates that the gas extraction resistance has decreased or is at a lower level. Controller 7 controls the connection pipe 5 to disconnect from the high negative pressure pipe 3 and controls the connection pipe 5 to connect with the low negative pressure pipe 4. In other words, controller 7 controls the connection pipe 5 to switch to the second connection state, resulting in lower energy consumption.

[0043] Specifically, the increase, decrease, or constant pressure value received by controller 7 is defined as follows: controller 7 has a preset comparison time and a preset pressure fluctuation range. During the comparison time, if the pressure value received by controller 7 from sensor 6 shows an increasing trend and exceeds the pressure fluctuation range, then the pressure value received by controller 7 is considered to have increased. If the pressure value received by controller 7 from sensor 6 shows a decreasing trend and exceeds the pressure fluctuation range, then the pressure value received by controller 7 is considered to have decreased. If the pressure value received by controller 7 from sensor 6 is constant or fluctuates but remains within the pressure fluctuation range, then the pressure value received by controller 7 is considered to have constant.

[0044] In an embodiment where sensor 6 employs the second type, such as Figure 2 As shown, sensor 6 is connected to connecting pipe 5 and is used to obtain the flow rate of the medium inside connecting pipe 5. In other words, sensor 6 is a flow sensor connected to connecting pipe 5 and is used to obtain the flow rate of gas extracted from borehole 2 into connecting pipe 5.

[0045] Sensor 6 is connected to controller 7, preferably but not limited to an electrical connection via wired or wireless means, to transmit the acquired flow rate value to controller 7.

[0046] The controller 7 is connected to the connecting pipe 5 to control the connection between the connecting pipe 5 and the high negative pressure pipe 3, and to control the connection between the connecting pipe 5 and the low negative pressure pipe 4, based on the received flow rate value. This allows the connecting pipe 5 to be switched between being connected to one of the high negative pressure pipe 3 and the low negative pressure pipe 4, and to be disconnected from the other. In other words, the controller 7 controls the connecting pipe 5 to switch between a first connection state and a second connection state based on the received flow rate value.

[0047] Optionally, the controller 7 has a preset flow threshold and can compare the acquired flow value with the flow threshold.

[0048] When the flow rate is less than the flow threshold, it indicates high gas extraction resistance. Controller 7 controls the connection between connecting pipe 5 and high negative pressure pipe 3, and controls the disconnection between connecting pipe 5 and low negative pressure pipe 4. In other words, controller 7 controls connecting pipe 5 to switch to the first connection state to ensure high gas extraction efficiency.

[0049] When the flow rate is greater than or equal to the flow threshold, it indicates low gas extraction resistance. Controller 7 controls the connection between pipe 5 and high negative pressure pipe 3 to disconnect, and controls the connection between pipe 5 and low negative pressure pipe 4 to connect; in other words, controller 7 controls the connection between pipe 5 and low negative pressure pipe 4 to switch to the second connection state, resulting in lower energy consumption.

[0050] Optionally, when the flow rate value received by controller 7 decreases, it indicates an increase in gas extraction resistance. Controller 7 controls the connection between connecting pipe 5 and high negative pressure pipe 3, and controls the connection between connecting pipe 5 and low negative pressure pipe 4 to be disconnected. In other words, controller 7 controls connecting pipe 5 to switch to the first connection state to ensure higher gas extraction efficiency.

[0051] When the flow rate received by controller 7 increases or remains constant, it indicates that the gas extraction resistance has decreased or is at a low level. Controller 7 controls the connection pipe 5 to disconnect from the high negative pressure pipe 3 and controls the connection pipe 5 to connect to the low negative pressure pipe 4. In other words, controller 7 controls the connection pipe 5 to switch to the second connection state, resulting in lower energy consumption.

[0052] Specifically, the increase, decrease, or constant flow value received by controller 7 is defined as follows: controller 7 has a preset comparison time and a preset flow fluctuation range. Within a certain period of the comparison time, if the flow value received by controller 7 from sensor 6 shows an increasing trend and exceeds the flow fluctuation range, then the flow value received by controller 7 is considered to have increased. If the flow value received by controller 7 from sensor 6 shows a decreasing trend and exceeds the flow fluctuation range, then the flow value received by controller 7 is considered to have decreased. If the flow value received by controller 7 from sensor 6 is constant or fluctuates but remains within the flow fluctuation range, then the flow value received by controller 7 is considered to have constant.

[0053] In some embodiments, such as Figure 2 As shown, the connecting pipe 5 includes a first pipe section 51, a second pipe section 52, a third pipe section 53, and a reversing valve 54.

[0054] The first pipe section 51 is connected between the inlet of the reversing valve 54 and the borehole 2, and is used to supply gas from the borehole 2 to the inlet of the reversing valve 54 and into the reversing valve 54.

[0055] The second pipe section 52 is connected between the first outlet of the reversing valve 54 and the high negative pressure pipeline 3, and is used to supply the gas discharged from the first outlet of the reversing valve 54 to the high negative pressure pipeline 3.

[0056] The third pipe section 53 is connected between the second outlet of the reversing valve 54 and the low negative pressure pipe 4, and is used to supply the gas discharged from the second outlet of the reversing valve 54 to the low negative pressure pipe 4.

[0057] The reversing valve 54 controllably opens one of the first outlet and the second outlet and closes the other, so that one of the second pipe section 52 and the third pipe section 53 is connected to the first pipe section 51 and the other is disconnected from the first pipe section 51. This allows the connecting pipe 5 to be switched between being connected to one of the high negative pressure pipe 3 and the low negative pressure pipe 4 and disconnected from the other. In other words, the connecting pipe 5 can switch between the first connection state and the second connection state.

[0058] In some embodiments, such as Figure 2 As shown, sensor 6 is connected to the first pipe section 51 to obtain the pressure or flow rate of the medium inside the first pipe section 51, which is then used as the pressure or flow rate of the medium inside the connecting pipe 5. Sensor 6 is connected to controller 7 to transmit the obtained pressure or flow rate to controller 7.

[0059] The controller 7 is connected to the reversing valve 54, preferably but not limited to an electrical connection via wired or wireless means, to control the reversing valve 54 to open one of the first outlet and the second outlet and close the other based on the received pressure or flow value, thereby switching the connecting pipe 5 between the first connection state and the second connection state.

[0060] The borehole 2 and connecting pipe 5 are preferably, but not limited to, multiple. Multiple sensors 6 are configured to be connected one-to-one with the first pipe section 51 of the connecting pipe 5. Multiple controllers 7 can be configured to be connected one-to-one with the sensors 6 and the reversing valves 54 of the connecting pipe 5, or they can be configured as one controller 7 simultaneously connected to multiple sensors 6 and multiple reversing valves 54, and capable of controlling the corresponding reversing valve 54 based on the pressure or flow value received by each sensor 6. Preferably, multiple controllers 7 are configured to be connected one-to-one with the sensors 6 and the reversing valves 54 of the connecting pipe 5, such as... Figure 2 As shown.

[0061] In some embodiments, such as Figure 2 As shown, the coal mine gas extraction system also includes an extraction pump station 8, which is located in the roadway 1. The extraction pump station 8 includes a high negative pressure extraction pump 81 and a low negative pressure extraction pump 82. The high negative pressure extraction pump 81 is connected to the high negative pressure pipeline 3 to generate negative pressure in the high negative pressure pipeline 3. The low negative pressure extraction pump 82 is connected to the low negative pressure pipeline 4 to generate negative pressure in the low negative pressure pipeline 4.

[0062] Specifically, the power of the high negative pressure pump 81 is preferably, but not limited to, greater than that of the low negative pressure pump 82, so that the negative pressure in the high negative pressure pipeline 3 is greater than that in the low negative pressure pipeline 4. The energy consumption of the high negative pressure pump 81 is greater than that of the low negative pressure pump 82.

[0063] When connecting pipe 5 is connected to high negative pressure pipe 3 and disconnected from low negative pressure pipe 4, high negative pressure extraction pump 81 is turned on and low negative pressure extraction pump 82 is turned off. This is to extract gas through high negative pressure pipe 3 and ensure high efficiency, while avoiding energy waste caused by turning on negative pressure extraction pump 82.

[0064] When the connection between pipe 5 and high negative pressure pipe 3 is interrupted and connected to low negative pressure pipe 4, high negative pressure extraction pump 81 is turned off and low negative pressure extraction pump 82 is turned on. This allows for gas extraction via negative pressure extraction pump 82 with lower energy consumption, while avoiding energy waste caused by turning on high negative pressure extraction pump 81.

[0065] In some embodiments, the borehole 2 is provided on the sidewall of the tunnel 1 and is inclined along the extension direction of the tunnel 1.

[0066] like Figure 1 As shown, roadway 1 extends in a left-right direction, and borehole 2 is located on the sidewall of roadway 1 and extends into coal seam 9, and is inclined in the left-right direction. This is to give borehole 2 a longer length in coal seam 9, expand the coverage area of ​​gas extraction in coal seam 9, and thus have higher gas extraction efficiency.

[0067] It should be noted that the extension direction of roadway 1 is also the advancing direction of the working face and the direction of coal seam 9. Therefore, borehole 2 is also inclined along the advancing direction of the working face and the direction of coal seam 9.

[0068] In some embodiments, such as Figure 1 As shown, the angle α between the drilling direction of borehole 2 and the extension direction of tunnel 1 is 30° to 60°, such as 30°, 40°, 45°, 50°, 60°, etc. The drilling direction of borehole 2 is, in other words, the length direction of borehole 2 or the axial direction of borehole 2.

[0069] In some embodiments, the tunnel 1 includes a transport tunnel 11 and a return air tunnel 12 arranged side by side. Both the sidewalls of the transport tunnel 11 and the return air tunnel 12 are provided with boreholes 2. Both the transport tunnel 11 and the return air tunnel 12 are provided with high negative pressure pipes 3, low negative pressure pipes 4 and connecting pipes 5. The high negative pressure pipes 3 and low negative pressure pipes 4 in the transport tunnel 11 are connected to the boreholes 2 on the sidewalls of the transport tunnel 11 through the connecting pipes 5. The high negative pressure pipes 3 and low negative pressure pipes 4 in the return air tunnel 12 are connected to the boreholes 2 on the sidewalls of the return air tunnel 12 through the connecting pipes 5. The boreholes 2 on the sidewalls of the transport tunnel 11 and the return air tunnel 12 are inclined in the same direction along the extension direction of the tunnel 1.

[0070] like Figure 1 As shown, both transport tunnel 11 and return air tunnel 12 extend in the left-right direction and follow the path shown. Figure 1As shown, the boreholes are arranged at intervals from top to bottom. A coal seam 9 lies between the transport roadway 11 and the return air roadway 12. Both the transport roadway 11 and the return air roadway 12 have multiple boreholes 2 arranged at intervals in the left-right direction on their sidewalls above the coal seam 9. The boreholes 2 on the sidewall of the transport roadway 11 extend from top to bottom and are inclined to the right, while the boreholes 2 on the sidewall of the return air roadway 12 extend from bottom to top and are inclined to the right. That is, they are both inclined to the right along the left-right extension direction of the roadway 1. The boreholes 2 on the sidewall of the transport roadway 11 and the boreholes 2 on the sidewall of the return air roadway 12 are not connected. Preferably, the bottom ends of the boreholes 2 on the sidewall of the return air roadway 12 and the bottom ends of the boreholes 2 on the sidewall of the transport roadway 11 are alternately arranged in the left-right direction.

[0071] Both transport roadway 11 and return air roadway 12 are equipped with high negative pressure pipes 3, low negative pressure pipes 4, and multiple connecting pipes 5. The connecting pipes 5 in transport roadway 11 are connected one-to-one with the drill holes 2 on the side wall of transport roadway 11, and are connected to the high negative pressure pipes 3 and low negative pressure pipes 4 in transport roadway 11. The connecting pipes 5 in return air roadway 12 are connected one-to-one with the drill holes 2 on the side wall of return air roadway 12, and are connected to the high negative pressure pipes 3 and low negative pressure pipes 4 in return air roadway 12, so that gas can be extracted from coal seam 9 simultaneously through the high negative pressure pipes 3 and low negative pressure pipes 4 in transport roadway 11 and return air roadway 12, thereby achieving higher extraction efficiency.

[0072] It should be noted that multiple boreholes 2 within the same roadway 1 are not limited to simultaneously connecting to the high negative pressure pipeline 3 or simultaneously connecting to the low negative pressure pipeline 4. Alternatively, some boreholes located in areas of high gas extraction resistance in coal seam 9 may be connected to the high negative pressure pipeline 3, while other boreholes located in areas of low gas extraction resistance in coal seam 9 may be connected to the low negative pressure pipeline 4. For example... Figure 1 As shown, the high negative pressure pipe 3 and the connected borehole 2 and connecting pipe 5 are shown in solid lines, while the low negative pressure pipe 4 and the connected borehole 2 and connecting pipe 5 are shown in dashed lines. Only the parts of the high negative pressure pipe 3, low negative pressure pipe 4 and connecting pipe 5 that are connected to the borehole are shown. Specifically, the part of the high negative pressure pipe 3 that is connected to the connecting pipe 5 but not connected is not shown. In the connecting pipe 5 that is connected to the high negative pressure pipe 3, the part that is connected to the low negative pressure pipe 4 but not connected is not shown.

[0073] In some embodiments, the bottom end of the borehole 2 connecting the high negative pressure pipeline 3 is located inside the coal seam 9, and the borehole 2 connecting the low negative pressure pipeline 4 penetrates the coal seam 9.

[0074] like Figure 1 As shown, the high negative pressure pipe 3, the connected borehole 2, and the connecting pipe 5 are represented by solid lines, while the low negative pressure pipe 4, the connected borehole 2, and the connecting pipe 5 are represented by dashed lines.

[0075] The bottom end of borehole 2, which connects to the high negative pressure pipeline 3, is located inside coal seam 9. In other words, the bottom end of borehole 2 is sealed. Therefore, the gas extraction resistance of borehole 2 is relatively high, and gas needs to be extracted through the high negative pressure pipeline 3.

[0076] The borehole 2, which connects to the low-pressure pipeline 4, penetrates the coal seam 9. In other words, the bottom end of the borehole 2, which connects to the low-pressure pipeline 4, is open and connected to the working face space. Therefore, the gas extraction resistance of this borehole 2 is low, and gas can be extracted through the low-pressure pipeline 4.

[0077] This extraction system can prevent gas accumulation in the upper corner and promote gas flow at the working face, further preventing excessively high gas concentrations at the working face.

[0078] The coal mine gas extraction system of this utility model embodiment is preferably, but not limited to, applied to the fully mechanized mining face of a coal mine. In other words, the roadway 1 is preferably, but not limited to, located in the fully mechanized mining face.

[0079] In the description of this utility model, it should be understood that the terms "center", "length", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0080] Furthermore, the terms "first" and "second" are used only for distinction and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0081] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0082] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0083] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0084] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A coal mine gas extraction system, characterized in that, include: The tunnel (1) is equipped with a borehole (2), a high negative pressure pipe (3), a low negative pressure pipe (4), a connecting pipe (5), a sensor (6), and a controller (7). The high negative pressure pipe (3) and the low negative pressure pipe (4) are both located in the tunnel (1). The negative pressure of the high negative pressure pipe (3) is greater than that of the low negative pressure pipe (4). One end of the connecting pipe (5) is connected to the borehole (2), and the other end of the connecting pipe (5) is connected to the high negative pressure pipe (3) and the low negative pressure pipe (4). The connecting pipe (5) can be switched to connect with one of the high negative pressure pipe (3) and the low negative pressure pipe (4) and disconnect from the other. The sensor (6) is connected to the connecting pipe (5) to obtain the pressure / flow rate of the medium in the connecting pipe (5). The sensor (6) is connected to the controller (7) to transmit the obtained pressure / flow rate to the controller (7). The controller (7) is connected to the connecting pipe (5) to control the connection between the connecting pipe (5) and the high negative pressure pipe (3) and the low negative pressure pipe (4) according to the received pressure / flow rate, so that the connecting pipe (5) can be switched to be connected to one of the high negative pressure pipe (3) and the low negative pressure pipe (4) and disconnected from the other.

2. The coal mine gas extraction system according to claim 1, characterized in that, The controller (7) has a preset pressure threshold and can compare the acquired pressure value with the pressure threshold. When the pressure value is less than the pressure threshold, the controller (7) controls the connecting pipe (5) to connect with the high negative pressure pipe (3) and controls the connecting pipe (5) to disconnect from the low negative pressure pipe (4). When the pressure value is greater than or equal to the pressure threshold, the controller (7) controls the connecting pipe (5) to disconnect from the high negative pressure pipe (3) and controls the connecting pipe (5) to connect with the low negative pressure pipe (4); and / or When the pressure value received by the controller (7) decreases, the controller (7) controls the connecting pipe (5) to connect with the high negative pressure pipe (3) and controls the connecting pipe (5) to disconnect from the low negative pressure pipe (4). When the pressure value received by the controller (7) increases and becomes constant, the controller (7) controls the connecting pipe (5) to disconnect from the high negative pressure pipe (3) and controls the connecting pipe (5) to connect with the low negative pressure pipe (4).

3. The coal mine gas extraction system according to claim 1, characterized in that, The controller (7) has a preset flow threshold and can compare the acquired flow value with the flow threshold. When the flow value is less than the flow threshold, the controller (7) controls the connecting pipe (5) to connect with the high negative pressure pipe (3) and controls the connecting pipe (5) to disconnect from the low negative pressure pipe (4). When the flow value is greater than or equal to the flow threshold, the controller (7) controls the connecting pipe (5) to disconnect from the high negative pressure pipe (3) and controls the connecting pipe (5) to connect with the low negative pressure pipe (4); and / or When the flow rate value received by the controller (7) decreases, the controller (7) controls the connecting pipe (5) to connect with the high negative pressure pipe (3) and controls the connecting pipe (5) to disconnect from the low negative pressure pipe (4). When the flow rate value received by the controller (7) increases and becomes constant, the controller (7) controls the connecting pipe (5) to disconnect from the high negative pressure pipe (3) and controls the connecting pipe (5) to connect with the low negative pressure pipe (4).

4. The coal mine gas extraction system according to any one of claims 1-3, characterized in that, The connecting pipe (5) includes a first pipe section (51), a second pipe section (52), a third pipe section (53), and a reversing valve (54). The first pipe section (51) is connected between the inlet of the reversing valve (54) and the borehole (2). The second pipe section (52) is connected between the first outlet of the reversing valve (54) and the high negative pressure pipe (3). The third pipe section (53) is connected between the second outlet of the reversing valve (54) and the low negative pressure pipe (4). The reversing valve (54) can controllably open one of the first outlet and the second outlet and close the other.

5. The coal mine gas extraction system according to claim 4, characterized in that, The sensor (6) is connected to the first pipe section (51) to obtain the pressure value or flow rate value of the medium in the first pipe section (51) and transmit the obtained pressure value or flow rate value to the controller (7). The controller (7) is connected to the reversing valve (54) to control the reversing valve (54) to open one of the first outlet and the second outlet and close the other according to the received pressure value or flow rate value.

6. The coal mine gas extraction system according to claim 1, characterized in that, The borehole (2) is located on the side wall of the tunnel (1) and is inclined along the extension direction of the tunnel (1).

7. The coal mine gas extraction system according to claim 6, characterized in that, The angle between the drilling direction of the borehole (2) and the extension direction of the tunnel (1) is 30° to 60°.

8. The coal mine gas extraction system according to claim 6, characterized in that, The tunnel (1) includes a transport tunnel (11) and a return air tunnel (12) arranged side by side. The sidewalls of the transport tunnel (11) and the return air tunnel (12) are provided with the boreholes (2). The transport tunnel (11) and the return air tunnel (12) are provided with the high negative pressure pipe (3), the low negative pressure pipe (4) and the connecting pipe (5). The high negative pressure pipe (3) and the low negative pressure pipe (4) in the transport tunnel (11) are connected by the connecting pipe. The pipe (5) is connected to the borehole (2) on the side wall of the transport tunnel (11). The high negative pressure pipe (3) and the low negative pressure pipe (4) in the return air tunnel (12) are connected to the borehole (2) on the side wall of the return air tunnel (12) through the connecting pipe (5). The borehole (2) on the side wall of the transport tunnel (11) and the borehole (2) on the side wall of the return air tunnel (12) are inclined in the same direction along the extension direction of the tunnel (1); and / or The bottom end of the borehole (2) connecting the high negative pressure pipeline (3) is located inside the coal seam (9), and the borehole (2) connecting the low negative pressure pipeline (4) penetrates the coal seam (9).

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